Loader Working Device

ABSTRACT

The disclosure relates to a loader working device for solving the problem of arranging the parts used in a vertical lifting mechanism of an existing loader. The loader working device comprises an accessory, an accessory overturning mechanism, and an accessory lifting mechanism including a movable arm, a movable arm oil cylinder, a front link rod and a rear link rod. The accessory lifting mechanism does not cause the accessory to interfere with a rocker arm and a front axle package of the loader working device. A connecting and mounting point of the movable arm and the accessory can be moved backwardly, thus improving a digging force and a tilting load at a low position of the loader working device.

TECHNICAL FIELD

The present disclosure relates to a working device, and moreparticularly, to a vertically lifted loader working device.

BACKGROUND

A working device is one of important components on a constructionmachinery loader, and different functions of a whole machine can berealized through different working device mechanisms. At present, acommon working device mechanism of the loader includes a six-link rodmechanism and an eight-link rod mechanism. The biggest market share isthe six-link rod mechanism, but this type of working device mechanismhas the problem that a tilting ability of the whole machine isinsufficient, the increase of tilting will lead to an increase in theweight of the whole machine, the insufficient ease of operation and anincrease in oil consumption of the whole machine. With the improvementof technical ability of the loader, the vertical lifting mechanismsolves this problem well, the vertical lifting mechanism has a shortload moment arm in a lifting process, which can realize a larger tiltingload with smaller weight of the whole machine and make the operationprocess of the whole machine more stable. At the same time, due to theshort load moment arm, useless work in the lifting process of theworking device is reduced, and the lifting ability of the working deviceis stronger. The currently used vertical lifting mechanism realizes alloperation functions of the loader through three sets of four-link rodmechanisms, compared with other link mechanisms, the vertical liftingmechanism uses more parts, which are arranged in the middle of theworking device with limited arrangement space. At present, an invertedbucket mechanism used in vertical lifting, an overturning oil cylinderis connected to an upper hinge point of a rocker arm and a short linkrod, with a high mounting position, which affects the visual fieldbefore operation. At the same time, the arrangement structure of thebucket mechanism is compact, at present, the arrangement requirements ofthe rocker arm are met through compressing a stroke of the overturningoil cylinder and changing an external structure of a bucket, forexample, an opening angle of the bucket and a receiving angle of thebucket of the working device are reduced to meet the mechanismrequirements, which affects the bucket performance and the operationperformance of the working device to a certain extent, thus resulting inpoor bucket filling rate, and the bucket needs to avoid the front hingepoint of the rocker arm, making the bucket structure complicated.

SUMMARY

The technical problem to be solved by the present disclosure is toprovide a loader working device for vertical lifting aiming at theproblem that a vertical lifting mechanism of existing loader uses moreparts, which are arranged in the middle of the working device and havelimited arrangement space.

The technical solution of the present disclosure to achieve the purposethereof is as follows: a loader device is arranged, which comprises anaccessory, an accessory lifting mechanism connected between theaccessory and a front frame of the loader, and an accessory overturningmechanism, wherein the accessory lifting mechanism is symmetrical leftand right about a central plane, and comprises a movable arm and amovable arm oil cylinder on left and right sides; one end of the movablearm oil cylinder is hinged to a point A on the movable arm, the otherend is hinged to a point B on the front frame, and a movable arm beam isfixedly connected between the two movable arms; the loader workingdevice further comprises a front link rod and a rear link rod; a frontend of the front frame is provided with a support;

a front end of the front link rod is hinged to a point C on the support,and a rear end of the front link rod is hinged to a point D on themovable arm;

an upper end of the rear link rod is hinged to a point E at the rear endof the movable arm, and a lower end is hinged to a point F on the frontframe; and

a convex quadrilateral is formed by connecting lines between projectionpoints of the hinge points A, E, F and D on a central plane; theconnecting lines between projection points of the hinge points C, E andD on the central plane form a triangle, and a projection point of thepoint D is located below the connecting line of the projection points ofthe point C and the point E. In the present disclosure, the accessorylifting mechanism is formed by superposing two four-link rods to realizevertical lifting, and a first four-link rod mechanism consisting of themovable arm, the rear link rod, the front frame and the movable arm oilcylinder realizes a lifting movement of the movable arm; and a secondfour-link rod consisting of the movable arm, the front link rod, thefront frame and the movable arm oil cylinder realizes horizontalrestraint in a lifting process, so that a distance between the accessoryand a front wheel is basically kept unchanged in the lifting process, soas to realize vertical lifting. In the present disclosure, the accessorycan be a loader bucket, a pallet fork or a holding fork, etc.

Preferably, in the loader working device above, the movable arm isprovided with a front link rod hinge arm extending downwardly, the rearend of the front link rod is hinged to a lower end of the front link rodhinge arm, and the front link rod hinge arm is located between themovable arm oil cylinder and the support at the front end of the frontframe.

Preferably, in the loader working device above, the accessoryoverturning mechanism comprises a pulling rod, a rocker arm, aoverturning oil cylinder, a three-hinge point holder and a self-levelinglink rod; the rear link rods at left and right sides are connected intoan H shape by a middle beam, a middle portion of the rocker arm ishinged to the movable arm beam, an upper end of the rocker arm is hingedto a rear end of the pulling rod, a front end of the pulling rod ishinged to the accessory, a lower end of the rocker arm is hinged to afront end of the overturning oil cylinder, a rear end of the overturningoil cylinder is hinged to a G hinge point of the three-hinge pointholder, an H hinge point of the three-hinge point holder is hinged tothe middle beam, an I hinge point of the three-hinge point holder ishinged to an upper end of the self-leveling link rod, a lower end of theself-leveling link rod is hinged to an L hinge point on the front frame,the G hinge point is located above the I hinge point, and the H hingepoint is located at a rear side of a connecting line between the G hingepoint and the I hinge point. Preferably, a forward Z-shaped six-link rodconsisting of the accessory, the pulling rod, the rocker arm, themovable arm, the overturning oil cylinder and the three-hinge pointholder at the front end of the accessory overturning mechanism realizesan overturning action of the accessory, and controls an overturningangle of the accessory and a digging force of the accessory. Theoverturning oil cylinder can be mounted at the lower end of the rockerarm, and the pulling rod can be mounted at the upper end of the rockerarm, thus reducing a mounting height of the overturning oil cylinder andimproving a front visual field. Meanwhile, an overturning movementdirection of the accessory is consistent with a movement direction ofthe rocker arm, which is beneficial to increasing the overturning angleof the accessory. Preferably, a four-link rod mechanism consisting ofthe three-hinge point holder, the self-leveling link rod, the rear linkrod and the front frame at the rear end of the accessory overturningmechanism realizes automatic leveling in an accessory overturningprocess, which is intended to solve the problem of asynchronous angleturnover of the lifting mechanism and the accessory overturningmechanism, and the four-link rod structure at the rear end controls thechange of the accessory overturning angle in the lifting process of thelifting mechanism, so that the change of the accessory angle relative tothe ground is smaller. The three-hinge point holder skillfully solvesthe connection problem of the overturning oil cylinder, the rear linkrod and the self-leveling link rod, and reduces the assembly difficulty.

Preferably, in the loader working device above, connecting lines of theG hinge point, the H hinge point and the I hinge point of thethree-hinge point holder form an equilateral triangle.

Preferably, in the loader working device above, connecting lines betweenprojection points of the I hinge point, the H hinge point, the F hingepoint and the L hinge point on a central plane form a parallelogram.

Preferably, in the loader working device above, the self-leveling linkrod is L-shaped, and an upper section thereof is bent backwardly.

Preferably, in the loader working device above, the overturning oilcylinder is located below a movable arm beam.

Compared with the prior art, the forward overturning mechanism is usedin the vertical lifting mechanism according to the present disclosure,the overturning movement direction of the rocker arm is consistent withthat of the accessory, the overturning oil cylinder can be arranged atthe lower end of the rocker arm, and the pulling rod can be connected tothe upper end of the rocker arm, so that the overturning oil cylindermoves downwardly, the working field at the front end of the workingdevice is improved, and better operation performance is provided for theuser. According to the present disclosure, the forward accessoryoverturning mechanism used in the vertical lifting mechanism does notcause the accessory to interfere with the rocker arm and the front axlepackage, and the connecting and mounting point of the movable arm andthe accessory can be moved backwardly, thus being beneficial toimproving the digging force and the tilting load at the low position ofthe working device. The mechanism has the self-leveling link rod toensure little change in the angle of the accessory during lifting. Therear link rod, the overturning oil cylinder and the self-leveling linkrod can be connected and mounted by adopting the three-hinge pointholder, thus greatly reducing the assembly difficulty and improving theassembly efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of a loader working device according tothe present disclosure.

FIG. 2 is a side view of the loader working device according to thepresent disclosure.

FIG. 3 is a sectional view of the loader working device according to thepresent disclosure.

DETAILED DESCRIPTION

The detailed embodiment is described with reference to the drawings.

As shown in FIG. 1 and FIG. 2, a loader working device in the embodimentis a loader bucket working device, which comprises an accessory bucket,a bucket lifting mechanism connected between the bucket and a frontframe of the loader, and a bucket overturning mechanism, wherein thebucket lifting mechanism is symmetrical left and right about a verticalcentral plane, and comprises a movable arm 2, a movable arm oil cylinder4, a front link rod 6 and a rear link rod 5 on left and right sides; andthe two movable arms 2 are fixedly connected by a movable arm beam 9. Afront end of the front frame 3 is provided with a support 31. One end ofthe movable arm oil cylinder 4 is hinged to a point A on the movable arm2, and the other end is hinged to a point B on the front frame 3; afront end of the front link rod 6 is hinged to a point C on the support31, the movable arm 2 is provided with a front link rod hinge arm 21extending downwardly, a rear end of the front link rod 6 is hinged to alower end of the front link rod hinge arm 21, and the hinge point is apoint D. An upper end of the rear link rod 5 is hinged to a point E atthe rear end of the movable arm, and a lower end is hinged to a point Fon the front frame. A convex quadrilateral is formed by connecting linesbetween projection points of the hinge points A, E, F and D on a centralplane; the connecting lines between projection points of the hingepoints C, E and D on the central plane form a triangle, a projectionpoint of the point D is located below the connecting line of theprojection points of the point C and the point E, and the hinge point Dis located between the movable arm oil cylinder 4 and the support 31 ofthe front frame at the front end.

As shown in FIG. 3, a bucket overturning mechanism comprises a pullingrod 11, a rocker arm 10, an overturning oil cylinder 8, a three-hingepoint holder 7 and a self-leveling link rod 12; the rear link rods atleft and right sides are connected into an H shape by a middle beam, amiddle portion of the rocker arm 10 is hinged to the movable arm beam 9,an upper end of the rocker arm 10 is hinged to a rear end of the pullingrod 11, a front end of the pulling rod 11 is hinged to the bucket 1, alower end of the rocker arm 10 is hinged to a front end of theoverturning oil cylinder 8, a rear end of the overturning oil cylinder 8is hinged to a G hinge point of the three-hinge point holder 7, an Hhinge point of the three-hinge point holder 7 is hinged to the middlebeam, an I hinge point of the three-hinge point holder 7 is hinged to anupper end of the self-leveling link rod 12, a lower end of theself-leveling link rod 12 is hinged to an L hinge point on the frontframe 3, the G hinge point is located above the I hinge point, and the Hhinge point is located at a rear side of a connecting line between the Ghinge point and the I hinge point. Connecting lines of the G hingepoint, the H hinge point and the I hinge point of the three-hinge pointholder form an equilateral triangle. Connecting lines between projectionpoints of the I hinge point, the H hinge point, the F hinge point andthe L hinge point on a central plane form a parallelogram. Theself-leveling link rod is L-shaped, and an upper section thereof is bentbackwardly, thus avoiding interference between the self-leveling linkrod and the middle beam connecting the two rear link rods. Theoverturning oil cylinder is located below the movable arm beam.

In the present disclosure, the bucket lifting mechanism is formed bysuperposing two four-link rods to realize vertical lifting, and a firstfour-link rod mechanism consisting of the movable arm 2, the rear linkrod 5, the front frame 3 and the movable arm oil cylinder 4 realizes alifting movement of the movable arm 2; and a second four-link rodconsisting of the movable arm 2, the front link rod 6, the front frame 3and the movable arm oil cylinder 4 realizes horizontal restraint in alifting process, and controls a load moment arm to swing in a smallrange, so that a distance between the bucket 1 and a front wheel isbasically kept unchanged in the lifting process, so as to realizevertical lifting.

A forward Z-shaped six-link rod consisting of the bucket 1, the pullingrod 11, the rocker arm 10, the movable arm 2, the overturning oilcylinder 8 and the three-hinge point holder 7 at the front end of theaccessory overturning mechanism realizes an overturning action, andcontrols an overturning angle of the bucket and a digging force of thebucket. The overturning oil cylinder 8 is mounted at the lower end ofthe rocker arm 10, and the pulling rod 11 is mounted at the upper end ofthe rocker arm 10, thus reducing a mounting height of the overturningoil cylinder 8 and improving a front visual field. Meanwhile, anoverturning movement direction of the bucket is consistent with amovement direction of the rocker arm 10, which is beneficial toincreasing the overturning angle of the bucket. A four-link rodmechanism consisting of the three-hinge point holder 7, theself-leveling link rod 12, the rear link rod 5 and the front frame 3 atthe rear end of the bucket overturning mechanism realizes automaticleveling in an overturning process, which solves the problem ofasynchronous angle turnover of the bucket lifting mechanism and thebucket overturning mechanism, and the four-link rod structure at therear end controls the change of the bucket overturning angle in thelifting process of the bucket lifting mechanism, so that the change ofthe bucket angle relative to the ground is smaller. The three-hingepoint holder 7 skillfully solves the connection problem of theoverturning oil cylinder 8, the rear link rod 5 and the self-levelinglink rod 12, and reduces the assembly difficulty.

1. A loader working device, comprising: a front frame, wherein a frontend of the front frame is provided with a support; an accessory; anaccessory lifting mechanism connected between the accessory and thefront frame, wherein the accessory lifting mechanism is symmetrical leftand right about a central plane, and wherein the accessory liftingmechanism comprises: a movable arm on each of a left side and a rightside of the accessory lifting mechanism, wherein a movable arm beam isfixedly connected between the movable arms; and a movable arm oilcylinder on each of the left side and the right side of the accessorylifting mechanism, wherein one end of the movable arm oil cylinder ishinged to a point A on one of the movable arms, and wherein another endof the movable arm oil cylinder is hinged to a point B on the frontframe; an accessory overturning mechanism connected between theaccessory and the front frame; a front link rod, wherein a front end ofthe front link rod is hinged to a point C on the support, and wherein arear end of the front link rod is hinged to a point D on one of themovable arms; and a rear link rod, wherein an upper end of the rear linkrod is hinged to a point E at the rear end of one of the movable arms,and wherein a lower end of the rear link rod is hinged to a point F onthe front frame; wherein: a convex quadrilateral is formed by connectinglines between projection points of the points A, E, F, and D on thecentral plane; the connecting lines between projection points of thepoints C, E, and D on the central plane form a triangle; and aprojection point of the point D is located below a connecting line ofthe projection points of the point C and the point E.
 2. The loaderworking device according to claim 1, wherein the movable arm is providedwith a front link rod hinge arm extending downwardly, wherein the rearend of the front link rod is hinged to a lower end of the front link rodhinge arm, and wherein the front link rod hinge arm is located betweenthe movable arm oil cylinder and the support at the front end of thefront frame.
 3. The loader working device according to claim 1, wherein:the accessory overturning mechanism comprises a pulling rod, a rockerarm, an overturning oil cylinder, a three-hinge point holder, and aself-leveling link rod; rear link rods at the left side and the rightside are connected into an H shape by a middle beam; a middle portion ofthe rocker arm is hinged to the movable arm beam; an upper end of therocker arm is hinged to a rear end of the pulling rod; a front end ofthe pulling rod is hinged to the accessory; a lower end of the rockerarm is hinged to a front end of the overturning oil cylinder; a rear endof the overturning oil cylinder is hinged to a point G of thethree-hinge point holder; a point H of the three-hinge point holder ishinged to the middle beam; a point I of the three-hinge point holder ishinged to an upper end of the self-leveling link rod; a lower end of theself-leveling link rod is hinged to a point L on the front frame; thepoint G is located above the point I; and the point H is located at arear side of a connecting line between the point G and the point I. 4.The loader working device according to claim 2, wherein: the accessoryoverturning mechanism comprises a pulling rod, a rocker arm, anoverturning oil cylinder, a three-hinge point holder and a self-levelinglink rod; rear link rods at the left side and the right side areconnected into an H shape by a middle beam; a middle portion of therocker arm is hinged to the movable arm beam; an upper end of the rockerarm is hinged to a rear end of the pulling rod; a front end of thepulling rod is hinged to the accessory; a lower end of the rocker arm ishinged to a front end of the overturning oil cylinder; a rear end of theoverturning oil cylinder is hinged to a point G of the three-hinge pointholder; a point H of the three-hinge point holder is hinged to themiddle beam; a point I of the three-hinge point holder is hinged to anupper end of the self-leveling link rod; a lower end of theself-leveling link rod is hinged to a point L on the front frame; thepoint G is located above the point I; and the point H is located at arear side of a connecting line between the point G and the point I. 5.The loader working device according to claim 3, wherein connecting linesof the point G, the point H, and the point I of the three-hinge pointholder form an equilateral triangle.
 6. The loader working deviceaccording to claim 3, wherein connecting lines between projection pointsof the point I, the point H, the point F, and the point L on the centralplane form a parallelogram.
 7. The loader working device according toclaim 5, wherein the self-leveling link rod is L-shaped, and wherein anupper section thereof is bent backwardly.
 8. The loader working deviceaccording to claim 3, wherein the overturning oil cylinder is locatedbelow the movable arm beam.